Synthesis of aluminum-containing molecular sieves of SEW framework type

Abstract

A method is provided for directly synthesizing aluminum-containing molecular sieves of SEW framework type by interzeolite transformation.

The invention claimed is: 
     
       1. A method of synthesizing a molecular sieve of SEW framework type, the method comprising:
 (a) preparing a reaction mixture comprising:
 (1) a FAU framework type zeolite having; 
 (2) a source of a Group 1 or Group 2 metal (M); 
 (3) a structure directing agent (Q) comprising 1,6-bis(N-cyclohexylpyrrolidinium)hexane dications; 
 (4) a source of hydroxide ions; 
 (5) water; and 
 (6) seeds of a SEW framework type molecular sieve; and 
 
 (b) subjecting the reaction mixture to crystallization conditions sufficient to convert the FAU framework type zeolite to a molecular sieve of SEW framework type; 
 wherein the FAU framework type zeolite is the only silica and aluminum source in the reaction mixture. 
 
     
     
       2. The method of  claim 1 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   SiO 2 /Al 2 O 3   
                    10 to 500 
                 
                     
                   M/SiO 2   
                   0.05 to 0.50 
                 
                     
                   Q/SiO 2   
                   0.05 to 0.50 
                 
                     
                   OH/SiO 2   
                   0.05 to 0.50 
                 
                     
                   H 2 O/SiO 2   
                    15 to 80. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
       
     
     
       3. The method of  claim 1 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   SiO 2 /Al 2 O 3   
                    30 to 100 
                 
                     
                   M/SiO 2   
                   0.10 to 0.30 
                 
                     
                   Q/SiO 2   
                   0.08 to 0.25 
                 
                     
                   OH/SiO 2   
                   0.15 to 0.30 
                 
                     
                   H 2 O/SiO 2   
                    20 to 60. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
       
     
     
       4. The method of  claim 1 , wherein the FAU framework type zeolite comprises zeolite Y. 
     
     
       5. The method of  claim 1 , wherein the Group 1 or Group 2 metal comprises sodium. 
     
     
       6. The method of  claim 1 , wherein seeds are present in an amount such that a weight ratio of seeds/SiO 2  in the reaction mixture is in a range of 0.001 to 0.3. 
     
     
       7. The method of  claim 1 , wherein seeds are present in an amount such that a weight ratio of seeds/SiO 2  in the reaction mixture is in a range of 0.05 to 0.2. 
     
     
       8. The method of  claim 1 , wherein the crystallization conditions include a temperature of from 125° C. to 200° C. 
     
     
       9. The method of  claim 1 , wherein the molecular sieve of SEW framework type is SSZ-82.